The Carvable Pumpkins mod for 1.7.10/1.8 adds a new pumpkins that can have any pattern carved into it.
Download the Carvable Pumpkins Mod for 1.7.10/1.8:
Carvable Pumpkins Mod for 1.7.10
Carvable Pumpkins Mod for 1.8
Forge for 1.7.10/1.8
Installation:
Locate your Minecraft.jar file.
If you haven’t already installed Forge, drag the files from the forge zip file into Minecraft.jar.
Run Minecraft once
Drag the mod to the .minecraft/mods...